Lumber-bumper.



.I. H. HALL.

LUMBER BUMPER.

APPLlCATiON FILED 0014.191]. RENEWED NOV. 11.1918.

Patented Dec. 24, 1918 INVENTOR.

WATTOWY UNITE @TAE PATEN FFKC.

JOHN H. HALL, OF NAPAVINE, WASHINGTON.

LUMBER-BUMPER.

Patented Dec. 24, 1918.

Application filed October 4, 1917, Serial No. 194,649. Renewed November 11, 1918. Serial No. 262,034. 1

To all whom it may concern:

Be it known that I, J OHN H. HALL, a citizen of the United States, residing at Napavine, in the county of Lewis and State of Washington, have invented certain new and useful Improvements in Lumber-Bumpers, of which the following is a specification This invention has for its principal object to provide an improved and novel type of mechanism for operating lumber bumpers which are used in connection with cut-01f saws and the like in saw mills; to provide bumper operating mechanism which selectively engages a predetermined bumper only and which is operable from a central point. In saw mills and the like where each piece of lumber is trimmed to a length to which it is best suited it is necessary to have some form of stop or bumper against which to hold one end of the lumber while the other is being trimmed by the cut-0E saw. In the lumber mills the lumber is trimmed into lengths which vary by increments of two feet. Much of the lumber is heavy and is handled upon rolls in order to facilitate its movement and in this connection it is necessary that the bumpers be spaced either at one side of or intermediate the roll. It is also highly desirable that all bumpers except the one in use at that particular time be moved out of the path of the lumber. Quick, operable and simple means should be provided for the bringing of any desired bumper into the path of the lumber as needed. To this end applicant has perfected his device.

Other objects will appear as my invention is more fully explained in the following specification, illustrated in the accompanying drawings and pointed out in the appended claims.

In the drawings Figure 1 is a side elevation of my device with parts broken away. Fig. 2 is a cross-sectional end elevation of same.

Referring more particularly to the drawings numeral 1 indicates the usual roller frames within which rollers 2 are revolubly mounted. 3 indicates a cut-0E saw which is generally positioned at one end of the series of rollers. All of the above features are usual and applicants device may be used with them or with other similar arrangements. Numeral at indicates bumpers which are positioned atpredetermined intervals intermediate the rolls 2 and which normally have their upper ends slightly depressed below the top surface of the rollers in order to allow the lumber to pass completely over them. The bumpers as shown are what is known as the gravity type that is, those which under the influence of gravity return to normal position after having been raised within the path of the lumber My bumper raising device includes a shaft 5 which is supported in bearings 6 either above or below a floor 7. Bumper trips 8 are adjustably secured to shaft 5 and are spaced at such greater distances apart than the bumpers 4 as to have but one beneath one of the bumpers at any particular time. "It will be noted from Fig. 1 that the first trip to the left hand is beneath the first bumper, Whereas, the second and third are not in engagement with the bumper, therefore, only the first bumper will be operated as the device is shown set. A bumper raising lever 9 is slidably connected to the under face of each bumper and is pivoted as at 10, the free end of the lever being positioned just above the normal plane of the trips 8 so that the trips slide freely beneath the lever and they also engage and raise the lever when the shaft 5 is rotated. A bell crank rotating lever 11 is slidably keyed to shaft 5 and is operated by means of a foot lever 12 which permits of the shaft rotating through part of a revolution or sufficient to raise bumpers 4. A shift-lever 13 engages collars 14 on shaft 5 and is arranged to move shaft 5 together with trips 8 longitudinally along the center line of the said shaft until any desired one of the trips 8 is brought into position beneath the lever 9. A length gage 15 assists in determining the proper position of lever 13 in order to bring a particular trip under its bumper. It will be understood that in operation when it is desired to cut a particular piece of lumber into an 18 foot length that the lever 13 is moved to the right to point 18 on scale 15 which brings the trip 8 beneath its bumper at a distance 18 feet from the saw. By stepping upon the foot lever 12 the 18 foot bumper is then raised vertically somewhat above the top of the rolls and in position to engage the end of the lumber as moved forward along the rolls. When the foot lever 12 is released the weight of the bumper rotates the shaft 5 back into normal position.

While I have shown a particular form of embodlment of my invention, I am aware that many minor changes therein will read ily suggest themselves to others skilled in the art without departing from the spirit combination of a series of bumpers arranged in spaced relationship to each other, means for selectively engaging andraising any one ofthe bumpers of the series independent of the others, whereby anydesired bumper may be raised within the path of the material which normally travels above, it;

2. In a device of the class described the combination of a series of bumpers arranged in spaced relationship to each other, means for selectively engaging and raising any one of the bumpers of the" series independently of the others, said means including a shaft slidably mounted-beneath said bumpers,- trip Copies of this patient may be" obtained for five cents each, by a'ddressing the Commissioner of Patents.

levers adjustably secured to said shaft and arranged in spaced relationship With respect to the said bumper so that only one of thesaid trip levers will be in engagement Wlt'l'l one of the said bumpers at a time.

3..In a device of the class described the combination of a series of bumpers arranged in spaced relationship to each other, means for selectively engaging and raising any one of the bumpers of the series independent of the 0thers, said means including aashaft slidably mounted beneath said bumpers,.a shaftrotating foot lever slidably secured to the said shaft,and shifting levers engagingtlrefsa id shaft, whereby the shaft and its trip levers" may be'moved longitudinally of its center line until a predetermined triplever engages selectively a predetermined bumper which is raised by operation of the 

